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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36f363cbb49c61a3f250935febab2f71be38daae1e0fbe6d9e03afb8264c4c77' 
  AND token = 'mxBLBgGcIdbpm1FCnslPKVc9+4kav7/IVpdvtYK4Lr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}